Energy - põhjalik referaat energiast
electricity into lower voltage electricity. From the substation, distribution lines carry the
electricity to homes, offices and factories, which require low voltage electricity.
7.8 Measuring electricity
Electricity is measured in units of power called watts. It was named to honor James Watt,
the inventor of the steam engine. One watt is a very small amount of power. It would
require nearly 750 watts to equal one horsepower. A kilowatt represents 1,000 watts. A
kilowatthour (kWh) is equal to the energy of 1,000 watts working for one hour. The
amount of electricity a power plant generates or a customer uses over a period of time is
measured in kilowatthours (kWh). Kilowatthours are determined by multiplying the
number of kW's required by the number of hours of use. For example, if you use a 40-watt
light bulb 5 hours a day, you have used 200 watthours, or 0.2 kilowatthours, of electrical
energy. See our Energy Calculator section to learn more about converting units
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